1. Manifestations of non-linear viscoelasticity
The viscoelastic behaviour of polymers combined with large deformations can induce, in the case of fluids made of molten polymers, a set of specific phenomena of which the best known are swelling at the die exit, the presence of recirculations at the entrance to contractions, the Weissenberg effect and high elongational viscosity.
1.1 Swelling
Figure 1 describes the phenomenon of swelling at the die exit: a molten polymer extruded...
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Manifestations of non-linear viscoelasticity
Bibliography
Standards and norms
- Test method for melt flow rates of thermoplastics by extrusion plastometer. - ASTM D 1238-04c - 2004
- Plastiques. Détermination de l'indice de fluidité à chaud des thermoplastiques, en masse (MFR) et en volume (MVR). - NF EN ISO 1133 - 2005
- Plastiques. Détermination de l'indice de fluidité à chaud des thermoplastiques, en masse (MFR) et en volume (MVR). - ISO 1133 - 2005
- Plastics : Determination...
Patents
Rheometer for injection molding machine, A. HADDOUT, G. VILLOUTREIX, FR-2621525, EP-0624244A1/B1
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